Sequatchie Formation, Colvin Mountain Sandstone, Greensport Formation undifferentiated

Variegated dusky-red and pale-yellowish-orange shale, calcareous mudstone, dolomite, siltstone, and minor sandstone. Mapped in areas of facies transition with the Chickamauga Limestone (Scraper Mountain) and in the structurally complex area at the east end of Dry Creek Mountain.
State Alabama
Name Sequatchie Formation, Colvin Mountain Sandstone, Greensport Formation undifferentiated
Geologic age Ordovician
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone (Calcareous)Greensport Formation - calcareous mudstone
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Carbonate > Dolostone
Minor
Sedimentary > Clastic > Sandstone
Sedimentary > Clastic > Siltstone
Incidental
Sedimentary > Clastic > Mudstone > Claystone > BentoniteColvin Mountain Sandstone - locally contains thin beds of bentonite in the upper part.
References

Szabo, M.W., Osborne, E.W., Copeland, C.W. Jr., and Neathery, T.L., 1988, Geologic Map of Alabama, Geological Survey of Alabama Special Map 220, scale 1:250,000.

NGMDB product
Counties Calhoun - Cherokee